diff --git a/Manuals/Tcpi-ug/Configurations.ent b/Manuals/Tcpi-ug/Configurations.ent
index 44496c3..410c988 100755
--- a/Manuals/Tcpi-ug/Configurations.ent
+++ b/Manuals/Tcpi-ug/Configurations.ent
@@ -1,6 +1,7 @@
 <!ENTITY configurations                 SYSTEM "Configurations.docbook">
 <!ENTITY configurations-dialup          SYSTEM "Configurations/Dialup.docbook">
 <!ENTITY configurations-dialup-intro    SYSTEM "Configurations/Dialup/intro.docbook">
+<!ENTITY configurations-dialup-usage    SYSTEM "Configurations/Dialup/usage.docbook">
 <!ENTITY configurations-dialup-modem    SYSTEM "Configurations/Dialup/modem.docbook">
 <!ENTITY configurations-dialup-server   SYSTEM "Configurations/Dialup/server.docbook">
 <!ENTITY configurations-dialup-client   SYSTEM "Configurations/Dialup/client.docbook">